Add progress status output for export and import data loader CLI operations

[inv-jishnu]

Description

This PR introduces progress status display for import and export operations in the Data Loader.
For export operations, the progress display is not continuous but provides key status updates.

The primary goal is to give users real-time feedback (especially for imports) on how the process is executing, through concise progress messages. This enhancement replaces the previous log-based progress outputs that were removed from the core module.

Related issues and/or PRs

NA

Changes made

• Added a listener implementation to track and update the progress of the import process.
• For export operations, implemented a simpler progress update that displays the start and end of the process, along with the total number of records exported at completion.

Checklist

The following is a best-effort checklist. If any items in this checklist are not applicable to this PR or are dependent on other, unmerged PRs, please still mark the checkboxes after you have read and understood each item.

• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation to reflect the changes.
• I have considered whether similar issues could occur in other products, components, or modules if this PR is for bug fixes.
• Any remaining open issues linked to this PR are documented and up-to-date (Jira, GitHub, etc.).
• Tests (unit, integration, etc.) have been added for the changes.
• My changes generate no new warnings.
• Any dependent changes in other PRs have been merged and published.

Additional notes (optional)

NA

Release notes

Add progress status output for export and import data loader CLI operations.

[ypeckstadt]

We will pick this up later for a next ScalarDB release and wil not be included in 3.17.